Temperature-wavelength dependence of terbium gallium garnet ceramics Verdet constant
Temperature-wavelength dependence of terbium gallium garnet ceramics Verdet constant
复制标题
DOI：
10.1364/ome.6.003683
复制
发表时间：
2016-11
影响因子：
2.8
通讯作者：
O. Slezák;R. Yasuhara;A. Lucianetti;T. Mocek
中科院分区：
文献类型：
--
作者：
O. Slezák;R. Yasuhara;A. Lucianetti;T. Mocek
本文对测量磁活性材料法拉第旋转的偏振步进法进行了改进，使之能测量费尔德常数随波长和温度的变化。它已被用于比较的波长和温度依赖的费尔德常数，主电子跃迁波长，居里-外斯温度在铽镓石榴石（TGG）单晶和TGG陶瓷样品。在1.064 μm和0.632 μm波长下，所有样品的Verdet常数分别为36.6 ~ 44.2rad/T·m和122.4 ~ 155.5rad/T·m。这些结果与文献中单波长测量得到的值非常匹配，并且分别对单晶和陶瓷显示出相同的测量误差。首次对TGG陶瓷的居里-外斯温度进行了测定。该方法可用于在宽的波长和温度范围内详细表征材料的磁光性质，这对于正确设计法拉第器件具有重要意义。
A polarization-stepping method for measurement of the Faraday rotation in magneto-active materials has been modified for evaluating the Verdet constant as a function of wavelength and temperature. It has been used for a comparison of wavelength and temperature dependent Verdet constant, dominant electronic transition wavelength, and Curie-Weiss temperature in terbium gallium garnet (TGG) single crystals and TGG ceramics samples. The room-temperature values of Verdet constant varied from 36.6 to 44.2 rad/T.m at 1.064 μm wavelength and from 122.4 to 155.5 rad/T.m at 0.632 μm wavelength for all samples under investigation. These results match very well the values obtained from single wavelength measurement in the literature and show the same measurement error for single crystal and ceramics, respectively. The Curie-Weiss temperature has been evaluated for the first time in TGG ceramics. This method could be used for the detailed characterization of magneto-optical properties of the materials over a wide range of wavelengths and temperatures which is of great importance for the proper design of Faraday devices.